fsk interface and cw keying interface

FSKinterfaceandCWKeyingInterface
- Easy to build RS232 keyinginterface for FSKandCW. Works with most popular RTTY software like MMTTY. Also works for with most contest software such as N1MM and Writelog for CWkeying. Uses the RS232 port RTS, DTR, or TX data, optically isolated, PC boards available.